253605646464 has 32 divisors (see below), whose sum is σ = 673639999440. Its totient is φ = 84535215360.

The previous prime is 253605646453. The next prime is 253605646487. The reversal of 253605646464 is 464646506352.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330215302 + ... + 330216069.

Almost surely, 2^253605646464 is an apocalyptic number.

253605646464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

253605646464 is an abundant number, since it is smaller than the sum of its proper divisors (420034352976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

253605646464 is an equidigital number, since it uses as much as digits as its factorization.

253605646464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660431388 (or 660431376 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 51.

The spelling of 253605646464 in words is "two hundred fifty-three billion, six hundred five million, six hundred forty-six thousand, four hundred sixty-four".